SlideOnThumbnailOver: Boolean, default falseįlickThreshold: Number (float), default 0.4 transition duration while swiping in milliseconds.SwipingTransitionDuration: Number, default 0 transition duration during image slide in milliseconds.IndexSeparator: String, default ' / ', ignored if showIndex is false handles both slide image, and thumbnail image.an image src pointing to your default image if an image fails to load.OnErrorImageURL: String, default undefined disables keydown listener for keyboard shortcuts (left arrow, right arrow, esc key)ĭisableThumbnailSwipe: Boolean, default false.disables the thumbnail container from adjusting.if true, gallery's direction will be from right-to-left (to support right-to-left languages)ĭisableThumbnailScroll: Boolean, default false.if false, will use translate instead of translate3d css property to transition slides.if false, fullscreen will be done via css within the browser.UseBrowserFullscreen: Boolean, default true ![]() ShowFullscreenButton: Boolean, default true available positions: top, right, bottom, left.ThumbnailPosition: String, default bottom A function that will be called upon bullet click.Let’s now see how we can abstract all these functions so that they’re re-usable.Import ImageGallery from 'react-image-gallery' const images = [ ) The corresponding branch at this point is 03-lazy-loading. In the picture below, we see the default lighthouse image still showing in some of the spaces. When the element comes into view, the value on the data-src property replaces the default image. The default image usually has a small size so that we’re downloading as little as possible. We set a default source for every element and store the image we want to show on the data-src property. When this changes it triggers the useEffect hook and in turn imgObserver get called with each element. Note that we added imgData.images as a dependency of the useEffect hook. Then we iterate over each image and set an observer on it. card-img-top on the page with document.querySelectorAll. In the following useEffect hook, we grab all the images with a class of. As with the scrollObserver function, we wrap imgObserver in a useCallback hook to prevent un-ending component re-render.Īlso note that we stop observing an img element once we’re done with the substitution. Notice that we first check if the new image source exists before doing the swap. When the page hits an intersection, as determined by en.intersectionRatio > 0, we swap the image source on the element. Var intObserver = new IntersectionObserver(entries =>, ) Īs with scrollObserver, we define a function, imgObserver, which accepts a node to observe. With that you can be able to implement infinite scroll and image lazy loading in your React application where necessary. We would also have learned a few more things about React Hooks. Our goal is that at the end of this article, we will have implemented infinite scroll and image lazy loading using a native HTML API. Some familiarity with React hooks will be beneficial but not required, as we will be taking a look at a few. The reader should possess a working knowledge of React functional components. ![]() In this article, we’re going to explore some use cases for the Intersection Observer API in the context of a React functional component. If you have been looking for an alternative to pagination, infinite scroll is a good consideration. ![]() In the process, we’ll learn how to use some of React’s hooks and how to create Custom Hooks. In this tutorial, we’re going to learn how to use the HTML Intersection Observer API to implement infinite scrolling and image lazy loading in a React functional component.
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